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Plants are far more abundant on the Earth than animals, so it is much easier for a large animal needing a lot of food to obtain that food from plant sources than from animal sources. However, the very largest animals, baleen whales, actually eat tiny sea creatures from the animal kingdom. They strain this "krill" from the seawater with the baleen in their mouths which they have in place of teeth. Krill is mainly baby shrimp.

On land, small animals can scurry about and be hard to catch, but plants hold still, so a large and clumsy grazing animal can fill up on plants without investing a lot of energy in catching its prey. Some large land animals, such as bears, will catch and eat other large land animals when they are available.

In the sea, there are giant sharks, seals, toothed whales, and squid which are carnivorous, so not all giant creatures are vegetarians. However, large fierce predators are rare compared to grazing animals.

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